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Is sexual orientation a myth?

What are we to make of ‘sexual orientation’?

If many adolescents experience bisexual attraction, if some people change their orientation, if most homosexuals are actually bisexual, and if diverse sexual practices can become strongly addictive, is a fixed orientation actually a myth?

Peter May

Studies of twins

Studies of identical twins have repeatedly shown that sexual orientation is not determined genetically. Identical twins with identical genes do not always have the same orientation. If one is homosexual, the other is far more likely to be heterosexual. Even though statistically, compared with the general population, there is an increased chance that the twin will be homosexual, this is far from guaranteed. So though there may be a genetic ‘tendency’ toward homosexuality, sexual orientation is not genetically ‘determined’.